6878321 has 2 divisors, whose sum is σ = 6878322. Its totient is φ = 6878320.

The previous prime is 6878273. The next prime is 6878341. The reversal of 6878321 is 1238786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5340721 + 1537600 = 2311^2 + 1240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6878321 is a prime.

It is a super-2 number, since 2×6878321² = 94622599558082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6878341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3439160 + 3439161.

It is an arithmetic number, because the mean of its divisors is an integer number (3439161).

Almost surely, 2^6878321 is an apocalyptic number.

It is an amenable number.

6878321 is a deficient number, since it is larger than the sum of its proper divisors (1).

6878321 is an equidigital number, since it uses as much as digits as its factorization.

6878321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 35.

The square root of 6878321 is about 2622.6553338172. The cubic root of 6878321 is about 190.1782353340.

The spelling of 6878321 in words is "six million, eight hundred seventy-eight thousand, three hundred twenty-one".